Stone-sawing machine



1,674,519 S. S. PATTERSON STONE gAwING MACHINE Filed sept. 21; 1927 4 sheets-heet 1 .Wlrnlwlndmww wax g 1 ?m NN Sw 0 u. www JTIT. A 6^ QN JuneA 19, 1928.

i Junels, 192s,

1,674,51 9 S. S. PATTERSON STONE sAwING MACHINE FiTed sept. 21V, 1927 4 sheets-sheet 2 INVENTOR 1 fatrsaa.

' v ATTORNEY June 19, 1928. 1,674,519

srs. PATTERSON I STONE sAwING MACHINE4 Filed sept. 21, 1927v 4 Sheets-Sheet 5 June 19, 1928.

s. s. PATTERSON STONE sAwlING MACHINE Filed sept. 21, 1927 4 Sheets-Sheetv Nav,

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ATTORNEY Patented .lune 19, 1928.,` v il 4 I UNiTiEDfSTArES PATENTV oFFicEf.

SANFORD sivriTH PATTERSON, on ATLANTA, "GiioRGIA, AssiGN'oR To 'MAY rTTERso'N GOODRUM, or ATLANTA, GEORGIA'.

sToNE-fsAwiNG MACHINE.

Appueation sied september 21., 1927. serial No. 221,008.

The invention generally relates to stone bodying the ,invention and mountable for sawing machines and has for objectto use.A l y: provide Certain newland useful, ii'nprove- Y FigureQ is a vertical longitudinal section ments in machinesof that type, by the em taken through one of the vsaw end carrying 5 ployment of which the stone sawing may be cars. l v l I f accomplishedv in a highly efficient manner, Figure 3 is a horizontal section taken on with a minimum. ofy wear on the Working the line 3-3 on Figuref2.

parts and inwhich all tendency towarddisv Figure 4l is a vertical cross section ltaken ablingrof the parte and possibility of break# on the line 4-4 on Figure 2. ,Y J j Y l" age is practically eliminated u Figure 5 is an enlarged somewhat diam,

Theinvention further has for its object to grammatic-vertical longitudinal section of provide a sawingmachine of the character one vof the saw actuating `pneumaticY heads.``v

stated in which the parts aresimple in ar- Figures 6, 7 vand 8 are diagrammatic side rangement and constructionand economical lelevations illustrating the manner -of recip- 15 to manufacture and operate, and are so rocating the saw. 1 i f 65 forin-ed and cooperatively arrangedfthat the Figures 9 and 10 are fragmentary side sawing functionA is accomplished without and plan views villustrating'the means. for shock or jerk-y motion and VVin a natural and mountingthe sa\v eiids,rpart;of theA latter smooth manner, assuring high-class woil; vView being shown ,in horizontal section;VV if 20 and eliminatingall possibilities of the' saw Figure 11 is a fragmentary lside 4viewil- 7u becoming bent, broken, buckled or twisted lustrating a portion of thev saw in the saw while ingoperation. A y, lerf. u y v,M."

The invention further resides inthe pro- Figure 1'2 is a sideelevation ofha modified vision of means to impart a rapid, balanced arrangementlofthe invention embodied in a 25 and cushionedV reciprocation to the saw, portablestructure for small Work.` l, ,Y 75 occasioned by alternate drags always at the `Figure 13 is a horizontalsection taken on leading end thereof, and means toyieldably the linelflon Figure l2.` d y n A v, hold the saw to the work while operatingto In the vdrawings, 'l represents a suitable accomplish the sawing function without any supporting base of concrete or the like on ao forcing action. l Y which the stone to be cut, Vindicated at @gis 50 The invention further resides in the promounted upon a'suitable support 3.( on ya caij, vision of means acting simultaneously with y truck or wooden holsters, as indicated in each. alternate saw drag to resist said Vdrag iguie 3 ofthe drawings), ln the base `floor at the opposite end of the saw' and' serve. to abradant collecting troughsfl are provided :aa assure holding the saw taut in a manner proin suitable positions to receive Vand collect the g5 viding for more efficient cutting and overabradants used tokfacilitate the cutting accoining all tendency'to buckle. t Af Ation so that they'niay be readily taleiiup To the attainment of the aforesaid ,objectst and reused.r Y c y f and others that will be obvious, the linven- Outwardly of each end of the stone mounttion still further resides in the provision ol ing space'` a saw mounting shaft, generally o the novel details of construction. combinaindicated at 5. is-providedandsecured Easat tion and arrangement :of parts, allvof which' G, to jthejbase l to stand uprightly therefrom Vwill be first. fully described in the following in `vvertical parallel spaced relation. Each detailed description, Vthen be partic ularl..T fof the shafts includes closedsidewalls1 ,Uinpointed out in the appended claiinsgreferside bent angles Sand-outside aflixed angles 95, ence being had" to the accompanying fdraW- 9 providing a vertical`guideway:openv at its in's, in which: 1, ends and' closedr at sides, see Figure 3. l igure l is a somewhat diagrammatic side The, angles k9 serve fas tracks for the antielevation illustrating a stone sawing ;1n`africtiongrollers-l() secured atthe outside cor- Chine of th@ Stationary 01? rigid WP@ Gm este of.' thecars l 'veitii slidable in the 10e Each car 11 includes closed side v' *s 14, top and bottom plates 15 and 1 respectively,

and a closed iront or inside Wall 17, the backs or outer ends of the cars remaining open, as indicated in Figure Ai pulley 18 is provide at the top of each car 11 and has its shank passed through the top plate of the car and attached to a cush ion springI 19 serving as a yield able support ller the car and. serving to cushionssupport its Weight.

Acable 2O is passed around one of `the pulleys 18 and has one end tired to a hook 21 dependingl from the respective shaft Vtop cover plate 22 and its other end passed around and secured to the large pulley 23 mountedv on top of said plate, one oit said pulleys being mounted on each shalt top plate 22. Another cable is passed around the pulley 18 o'l. the other car and has one oil, its ends attached to the hook 25 depend ing;` from the respective shaft top plate 22 and its other end passed around and over the pulley Y23 mounted on the said plate, around and over the pulley 23 on the first mentioned top plate 22 and over another large 'pulley 215 mounted on the lirst mentioned shail't and has its tree end attached to a counterbalantV Weight 27 (see Figure 1). Y

rlhe Weight 27 is heavy enough to counterbalance the weight oit the cars 11 and the arrangement or" the cables and pulleys is such that when. the Weight is raised or lo\v ered the cars will be correspondingly lowered or raised and will remain at their adjusted positions. It shouldbe understood that it is not' my intention to torce-iteed the saw to the work. l rely solely on the rapid recipro'catory motion ot the saw `and no more pressure is applied to the `said sanv than is necessary to present it to the Werl: or merely keep it in engagement with the work. A pneumatic hose or other conductinga line 8 is provided and is supplied with compressed' air or other suitable power fluid through the pipe line 29 from any suitable source of supply, The line 29 is controlled by a valve 30 which may be adjusted to permit passage of air into the hose 28 to cause actuation of the saw ooe/rating devices or to cut ott the flow of fluid to the said line and permit the fluid contained in the line to bleed out through the valve so that the operatingdevices Will cease to function.

It will be found convenient to support the loop ofthe hose 28 upon any suitable sup- ,porting medium 31 and to carry he ends thereof over suitable supporting` pulleys 32 mounted on the tops ot the guide shafts 5,

reveals the extreme ends of the hose being` directed into the Vopen rear or outer portions of the cars 11, as indicated at 33 in Figures 1 and Each car 11 is equipped with a pneumatic head Silsecured as at35 upon a carrier plate 36 Which is longitudinally slidable in grooved standards 37 secured at 38 upon the car bottom plates 16, see Figures 3 and el.

The plates 36 are .longitudinally slidable in the cars so that the positions olf the heads 34 may be varied for a purpose later to be described. To accomplish this purpose l provide each car with an adjustment screnv 39, equipped atits outer end With a hand Wheel 4l() and having its shank freely rotatably mounted in a laca-ring,` 41 carried by the car bottom` plate 16. Vlhe threaded portion of the screw Works in athreaded bore in a lng 42securedto depend from the plate 36. Thus when the hand wheel Zl0 is rotated the plate 36 to which Vthe lug' #.12 is attached will be advanced or retracted in itsgrooved mountings. i i

ln each pneiiluatie head or cylinder 34 a piston d3 is recprocable, the said cyliiildcrs being open at one end and closed at their other or innerl e; ds, as at 111. Into the closed end fr-fl' oli each pneumatic head an air inject ing' and relieving tube l15 is projected, the other end ot the said tube beingv connected with a three-Way Salve Il@ including an exhaustport 47 and a throat to connect with the air pipe 18, which is in turn connected by the union 119 to the respective air hose end 33. Each valve stembi the valves 4G is provided with a turning,v crank 50.

A piston rod 51 is carried by cach piston and projects `rially through the open end of the pneumatic head to be pin and slot connected 52 with a vertical cross head 53 and cause the said cross head to move with the piston. Drag arms 5dare provided and are connected to the ends ot' the cross head 53 to be caused toV reciprocatev With the cross head, a suitable slotivay 55 being' provided in each plate 36 to permit the necressary reciprocatimi ot the cross head.

The inner ends of the arms Eflare passed througli bearingequipped opening-.gs 5G in the inner Walls 17 ot the cars,"ivhich said openings are protected by' flexibleV boots 57 of leather, rubber, or other suitable material, from abrasive dust.` Suitable,passageivays 58 also are provided in the-lugs 112 topermit free passage of the lower arms 54:.

The eXtreme inner ends of the arms 54 are secured as at 59 to "l`heads which are in turn secured to other T-heads 6`O having sav'rendV lll) of closely positioned cross apertures Gato aid in hold-ing ytlie abradants 66- (shot, crushed steel or 'the like) used to facilitate the sawing action. lVhen one series of vapertures wear outthe next series will vcome into function, see Figures l andll.

' The cross heads 53 are alsoeach connected as atj67'to a retractile spring 68, the'other end 'of which is 'adjustably connected 'as yat ('39 to a cross brace 70 which may be adjustably secured to the car side walls, see Fig ures l, 2 and 8. The purpose lfor "the springs will later be apparent;

Each upper drag arm 54 is provided with a pair of spaced valve 'actuating fingers 7l adapted,` as the said arm is reeiprocated7 to alternately engage the vvalve crank arm and properly change the 'position of the valve to cause air injection behind the piston inthe closed end of' the cylinder on the power or drao stroke of the respective piston and saw A'end and to -relieve pressure 'behind the piston throughfthepipe 45 and exhaust port i7 when the pneumatic head in the other car is functioning to drag` cthes'aw in the reversedi'rection, vsee Figure 2.

Each 'lower drag arm 54, where it pro- 'jects yout ot the inner car wall, is provided withupwardly lilirojecting spaced apertured ears 72 to which the rocker end 73 of a yieldable hold-ldowfn-lever 74v is' loosely piv'- ote'cl at 7 rllhe pivot Serves to connect the arm and lever while permitting the end 73 of the lever which is curved on Van are, to rol-l onr the upper Yedge of the said arm, see Figure 2. .llach Alever 74 is slotted as at 7G to straddle Athe respective upper arm 54 to permit independent movemen'tfof the lever and arm llongitudin'al'ly but not. laterally. At its upper end the lever is provided with 'a threaded 'shank 77 which ispass'ed through an aperture in a 'bracket 7 8`secured at 79 to the inner wall 17 of the `respective car;r A. coil spring 8O is "interposed 'between the shoulder Si the lever and vthe under side of the'braclqet 78 and serves vtojapply light pressurevto the lower arm within the limitation` oleredV the limiting' nuts 82 moiin'tedon t'lie'shanl 77 above the bracket .By -rockablyk mountinfg the lever 74 on the bracket 7S the sawis recip'roc'ated it will be elevatedslightly atthe end yof `each stroke; The amount of elevation is almost imperceptible but acts to exert the greatest l pressure at' the center oit the stroke 'and serves Yto 'firovid'e 'a more l"eilieie'nt cut and Also the Vlever Y belli'ngs fthrdugh which `the arms 521" pass permit siiilicierit `freedom 'of action off the arms in the :vertical directien, but, "like the Y 7 restrain the arms against lateral `or callyillust'rated ythe 'manner of reciprocating the saw'. By reference to these gnres, and to Figure 5, it willbe observed that the pneumatic 4heads operate alternately and in such manner 1that the power applied to the saw to reciprocate it is always la drag at'the advance end 4vof the saw blade and 'not a `'push atv the following endgof the'blade' Thus when one pneumatic head is operating tofdraw the saw toward it theypneumatic head -at ithe other 'side of the machine is' not functioning 'except to 'relieve' A?ai'r"I-i-n advance oit its piston to permit free movement thereof. vAlso` each power drag action lat 'one end of the saw is accompanied by a spring" resistance set up'bvthe spring 68 at the yopposite end of the saw serving to hold gthesaw tight andoverco'nie all tend- Vencyl toward buckling or whipping-faction and assure a strai'ght'smoot'h cut ofthe stone.

that position `until the power fluid lis turned on.'y 'Asl "the air 'or yother power fluid venters the particular piieu'matiehead whose piston is in position to rece-ive it,the piston will be forced fove'r the remainder of 'the stroke unvui Ythe valve 46, associated with 'that par'- It sh'o'uldbe understood that when the tieu'la'r cylinder, is actuated to out off the power Aiii-iid and 'open relief communication thro'ufgh th'e exhaustV port't'. At -thi's same instant the valve associated with the opposite to the saw at the opposite fenduv lt should pneu-matic head is actuated to close relief` rio also be understood that 'the springf68. yaty the l eii'd toward wliichlth'e is moving lat a particular time being slackened to reduce Aits tensin while :the `jc'orr'e'sp'ondingI spring r`at the opposite'for following eind of the saw is being "extended A'to increase its tension Va corresponding amount.

IThus a positive power impulse is impart- "ed y'to the radv'a-iiee end only of thesawon each ystroke corresponded by'a'n 'accompanyinf; sprini esistance at jthe opposite vlend of vingto hold the/saw taut. Als'o, in adc 'tion *to providing theV sa'w trailing `end resista-nce'iancl holding vthe parts -iny bal'- anced relation each spring which has been distended` serves to aid its accompanying pneumatichead on the next power stroke in direction toward the said distended spring. 1 y

In Figures l2 and 13 I have disclosed a modilied iiorm of the invention in which one shalt and car equipment is shown which is constructed in a manner permitting` its use in forming a more or less light' weight and portable machine that can` be used for smaller work.

In this form of the invention the shaft, whichmay be cooperatively associated with its acompanying shai't and with the work, in any approved manner, includes va base 83 and `upright corner standards Sli preferably constructed of hollow pipe sections and rigidly secured at 85 to the said base and to the cap plate 86. Car supporting and counterweighting devices 87 similar in construction and operation' to those employed in the stationary machine and the detailed construction oi WhichV has hereinbefore been described, are employed and indicated at 87, The vertically slidable car employed in this form of the invention also substantially the same as the cars hereinbe'liore described in ydetail in connection with thestationary machine and further detailed description thereot1 is deemed unnecessary in connection withl this form other than that the said cars are provided at ltheir corners with circular guides '88 tosurround and slidably ride on the corner standards 84. Y

Instead of the yicldable lever equipment F3-82 of the stationary machine the 'portable machine carsmay be provided with vertically yposition-ed springs 89 adjustably suspended at 90 from the cartop plateand connected at 91 to the knife carrying and operating devices and which serve to yieldably support the said devices in a manner similar ini some measures to the support furnished by the devices ol the stationary machine referred to.

By adjustably mounting the pneumatic heads 3% and the springs 68 variation in sawl lengths may be accommodated and the tension of the springs may be adjusted to suit conditions of use.

I also desire it understood that the pneumatic heads shown in this disclosure comprise but one simple means to impart the desired advance end drag to the saw and that any other power heads capable Vof accom lishinO like movements of the saw ma be employed without departing from the scope ofthe appended claims.

From .the foregoing. description, taken in connection with th-e accompanying drawings. it is ythought that .the novel details of construction, the manner of use and the advantages of my invention will be readily apparent tothose skilled in the art to which it relates. g c

ref/4,519

What I claim is: y l. In stone sawing machines, a pair of spaced supports between which the stone-to-V be-sawed is adapted to be placed, cars on the said supports7 saw carrying arms mounted on each car, a saw blade connected at its ends to said arms,l resilient means continuously tending to apply tension in opposite directions to said arms thereby to maintain the same taut, and power applying means associated with said arms for effecting reciprocation thereof and of the saw.

2. In stone sawingapparatus, a pair .of spaced supports between which the stone-tobe-sawed is located, a saw, a car on each support, reciprocatable saw carrying arms secured to each end of the saw and mounted on the respective cars, resilient tension applying means on each car to pull said arms in opposite directions thereby maintaining the saw taut and in a balanced position, and means on at least one car for effecting reciprocation et said saw carrying arms. y

3. In stone sawing apparatus, a pair oi; spaced supports between which the stone-tobe-sawed is located, a saw, a car on each support, reciprocatable saw carrying arms secured to each end oi' the saw and mounted on the respective cars, resilient tension applying means on each carto pull said arms in opposite directions thereby maintaining the saw taut and in a. balanced position,

tions thereby maintaining the saw taut and in a balanced position, means on at least one car for effecting reciprocation of said ksaw carrying arms, said tension applying means comprising a coiled spring connected to each car and to the arms atr the respectiveend, and said springs when at equilibrium having like tension stored up therein.

5. In stone sawing apparatus, a pair'or' spaced supports between which the stone-tobe-sawed is located, a saw, a car on each support, reciproeatable saw carrying arms se- .means on lat least one car ttor effecting recipcured to each end ot' the saw yand mounted on the respective cars, tension applying means on each car to pull said arms in opposite directions thereby maintaining the saw'V taut and in a balanced position, said tension applying means comprising a coiled spring connected toeach car and to the arms at the respective ends, said springs when at equilibrium having like tension storeduptherein, and a power device on eachkcar, saidkidevice being adapted to alternately apply va drag on t-he arms and saw at the respective ends and to reduce the stored tension of the adjacent spring while correspondingly increasing the tension on the other spring.

6. In stone sawing apparatus, a pair or spaced supports between which the ,stone-to- Vbe-sawed is located, a saw, a car on each support, reciprocatable saw carrying arms secured to each endA of the sawand'mounted on the respective cars, rtension applying means on each car to pull said arms inopposite directions thereby maintainingl the saw taut andin a balanced-position,said tension ap-r plying means lcomprising c-a coiled spring connected to each car and to the armsat the respective ends, said springsywhen at ,equilibrium having like tensioncstored up therein, a power device `on each car, said device being adapted to. alternately apply a drag on the arms and sawat the respective ends and to Yreduce the stored tension of the adjacent spring while correspondingly increasingthe tensionlon the other spring, and meansto adjust :the positions ofthe power devices' and the tension applying means for the purpose described. c f l j 7. In stone sawing apparatus, a pairV of spaced supports between which thesto'ne-tobe-sawed is located, a saw, a car` on each support, reciprocatable saw: carrying arms seicured to each end'of the saw and mounted on the respectivecars, tension applying means on each car to ypull said arms in opposite directions thereby maintaining the'saw taut and in a balanced position, said tension applying means comprising coiled, Yspring connected to eachcar and to thei'arms at the respective endssaid^springs whenoat equilibrium having like tension stored up there- Y in, a power device on'eajchcar, said device adapted'to alternately apply la, drag kon the arms and saw at the respective ends and'to reduce the stored tension of the adjacent on the respective cars, tension applying means on each car to pull said arms in opposite directions thereby maintaining vthe, saw taut and inca balanced position, a power headon each car comprising a cylinder closed at` lone end Vand open to atmosphere at its otherfend and a piston reciprocatable inthe cylinder and connected with the arms at that end, afluid pressure line, valves in the line -oneassociated;with eachr cylinder and communicating with atmosphere and in- `to the closed ,end of the cylindenand means actuated by movement of the arms to operlate .the valves to admit iiuidbehind'one piston at a time to? drive vit outwardlyjwhile simultaneously cutting off fluid communication in advance of the other pistonjand openingl communication with the areafin yadvance of said other piston to atmosphere; n

9. In i stone sawing machines, pair of spaced [supports between vwhich the stoneto-be-sawed is adapted: to be placed, cars on the said supports, saw carrying arms mount-v `ed on each car, Va saw blade connected at its ends to said arms, means continuously tending to apply`t.ension in oppositedirections to saidarms thereby to Vmai-ntainthe same taut, power applying means, associated with said arms for effecting reciprocation thereof and of the saw, and yieldable means atta'ched toy each car and' to the respective .carrying arms toyieldablysupport rsaid arms and the-respective saw end on Vthe car. j Y l0. iIn stonesawing machines, a pair of spacedl supports between -which the stoneto-be-sawed is adapted to be placed,cars ony the Said Supports; upper: andere" Saw @er rying arms mountedon each car, la saw blade connected; at its ends .'to. said arms, means continuously tending to `apply tension inoppositeldirec'tionsto saidarms thereby i to maintaingthe saw taut, power' applying means associated withsaid arms for eiecting reciprocation thereof and of the saw, yieldable means. attachedto eachcar and to the respective carrying arms tol yieldably c support said arms and the yrespective lsaw end on the car, each said last named'means comprising a lever slotted to straddle the upper arm and connected to the lower arm, and 'means to yieldably and. rockably mount the yupper end ofthe leveron'the car.

n l1; In stone .sawing machines,v a pair of spaced'supports between whichthe stone-tobe-sawed is adaptedto bev placed, cars onvthe rsaid supports,'upp`er and lower saw carrying armsmounted on each car, a saw blade consite directions to, said arms thereby to maintain the saw taut, power applying means `associated with said .arms for eiiiecting reciprocation thereof and of the saw, yieldable means attached to each car and to the respectiver carrying arms to yieldably support said arms and the respective saw end on the car, each of said last named` means coinprisinga lever slotted to straddle, the upper arm and lio vIiect'edy at itsfends to said'arins, means con- A v,tinuously tending toy apply tension in oppoconnected to the-'lower arm permitting relative longitudinal movement of the lever ,and upper arm but preventing lateral Itwist movement of the arms, and means to yieldably and rockably mount the upper end of the lever on the car.v

l2. In stone sawing machine, a pair or spaced supports between which the stone-tobe-sawed is adapted to be placed, cars on the said supports, upper and lower saw carrying arms mounted on each car, a saw bladeconnected at its ends to said arms, means continuously tending to apply tension in opposite directions to said arms therebytc maintain the saw taut, powerV applying means associated with said arms for effecting reciprocation thereof and of the saw,

yieldable means attached to each car and to the respective carrying arms to yieldably support said arms and the respective saw lever end Vterminating in an arcuate portion adapted to ride on said lower arm for the purposes specified.

13.' In a stone sawing machine, a saw blade, carrying means attached to each saw end, means associated with each carrying means to alternately apply end drags to the carrying means and saw, and tension springs normally having balanced stored tensions Aand alternately active to resist and aid alternately applied drag actions.

141-. In a stone carrying machine, a saw blade, carrying means attached to each saw end, means associated with each carrying means to alternately apply end drags to the carrying means and saw, a retractile spring associated with each carrying means, said springs normally having balanced stored tensions and being adapted to alternately aid the drag action applied by its associated carrying means and resist the drag action of the other carrying means.

15.111 stone sawing apparatus wherein is provided a saw blade adapted to be reciprocated, a support, a lcar vertically adjustably carried by the support, guides `for the car on the support, carrying armssecured'to the adjacent saw blade end and projecting into the car, means carried by the car toyieldably suspend the arms, a power head carried by the car'and adapted to apply av drag to the arms and adjacent blade end at intervals, and means at the other end ot the saw blade for maintaining the blade taut.

16. In stone sawing apparatus wherein is provided a saw blade adapted to be reciprocated, a support, a car vertically adjnstably carried by the support, guides for the car on the support, carrying arms secured to the adjacent saw blade end and projecting into the car, means carried by the car to yielldably suspend the arms, a power head'carried by the car and adapted yto apply a drag to the arms and adjacent blade end at intervals, means at the other end of the saw blade for maintaining the blade taut, and a retractile spring attached at one end to the car and at its other end to the arms and adapted to aid the drag applying action of the power head and to balance the action of the lmeans for maintaining the blade taut.

17. In'stone sawing apparatuswherein is provided a saw blade adapted to be reciprocated, a support, a car vertically adjustably carried by the support, guides ior the car on the support, carrying arms secured to the adjacent saw blade end and projecting'into the car, means carried by the car to' yieldably suspend the arms, a power head carried by the car and adapted to apply a dragto the arms and adjacent blade endy at intervals, said car having closed side walls and an inner closed wall vhaving openings to permit passage of the carrying arms, flexible Aboots secured to the car inner wall and the arms and surrounding-the openings to close them against abradant dust, and means atv :the other end of the saw blade for maintaining the blade taut. 1 f

18. In stonevsawing apparatus wherein is provided a saw blade adapted to'be reciprocated, a support,-a car vertically adjustably carried by the support, guides for the car on the support, carrying arms secured to the adjacent saw bladeend vand projecting into the car, meanscarriedby the car to yieldably suspend the arms, a power head and alretractile spring carried by the car and adapted to apply a drag to the arms and adjacent Y end at intervals, said car having closed side Vwalls and an inner closed 'wall having open-rv ings to permit passage of the carrying arms, flexible boots secured to the car inner wall and the arms and surrounding the openings to close them against ab'radant dust, means to adjust the positions oi' the power head and the retractile spring, and means at the other end of the saw bladefor maintaing the blade taut.

19.l In stone sawing apparatus wherein is provided a saw blade adapted to be reciprocated, a' support, a car vertically adjustably carried by the support, guides for the car on the support, carrying arms secured to the adjacent saw blade end and projecting into the car, means carried by the car to yieldably suspend the arms, a power head carried by `the car and adapted to apply a drag to the v arms and adjacentblade end at intervals, means to lsecure the carrying arms to the blade end comprising a T-head secured to the adjacent carrying arm ends, a second T-head secured to the first mentioned Tehead i and having a blade end receiving slot and keyways, said adjacent blade end having keyWays, keys inserted in the T-head and blade end keyvvays to secure the said blade end in the said slot and means at the other end of the saw blade for maintaining the saw taut.

20. In stone sawingapparatus wherein is provided a saw blade adapted to be reciprocated, a support, a Car vertically adjustably Carried' by the support, guides for the car on the support, carrying` arms'secured to the adjacent saw blade end and projecting into the oar, means carried by the ear to yieldably suspend the arms and prevent twisting of the blade, a power head comprising a cylinder and reciprocable piston connected to the carrying arms, means controlled by movement of the carrying arms to direct' Huid pressure into the Cylinder behind the piston at intervals to apply a drag to the arms and adjacenty blade end, and means at the other kendof the'saW blade for maintaining theV blade taut.

sANFoRDsMITH PATTERSON. 

